A novel route to Pt–Bi2O3 composite thin films and their application in photo-reduction of water

Moniz, Savio J. A.; Bhachu, Davinder S.; Blackman, Christopher S.; Cross, Alison J.; Elouali, Sofia; Pugh, David; Quesada-Cabrera, Raúl; Vallejos, Stella

doi:10.1016/j.ica.2011.09.029

Cited by 30 publications

(19 citation statements)

References 32 publications

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“…It allows the use of non‐volatile and thermally unstable precursors, better control of deposit stoichiometry, a higher rate of deposition, and a more flexible reaction environment than CVD (as it can be operated under atmospheric pressure in an open system). Several examples of the deposition of other bismuth‐containing films by AACVD can be found in the literature . Herein we report the extension of this methodology to the deposition of high‐performance nanostructured BiVO 4 thin film photoelectrodes.…”

Section: Introductionmentioning

confidence: 99%

Aerosol‐Assisted CVD of Bismuth Vanadate Thin Films and Their Photoelectrochemical Properties

Brack

Sagu

Peiris

et al. 2015

Chemical Vapor Deposition

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Thin film bismuth vanadate (BiVO 4 ) photoelectrodes are prepared by aerosol-assisted (AA)CVD for the first time on fluorinedoped tin oxide (FTO) glass substrates. The BiVO 4 photoelectrodes are characterised by X-ray diffraction (XRD), Raman spectroscopy (RS), and energy-dispersive X-ray (EDX) spectroscopy and are found to consist of phase-pure monoclinic BiVO 4 . Scanning electron microscopy (SEM) analysis shows that the thin film is uniform with a porous structure, and consists of particles approximately 75À125 nm in diameter. The photoelectrochemical (PEC) properties of the BiVO 4 photoelectrodes are studied in aqueous 1 M Na 2 SO 4 and show photocurrent densities of 0.4 mA cm À2, and a maximum incident-photon-to-electron conversion efficiency (IPCE) of 19% at 1.23 V vs. the reversible hydrogen electrode (RHE). BiVO 4 photoelectrodes prepared by this method are thus highly promising for use in PEC water-splitting cells.

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Section: Introductionmentioning

confidence: 99%

Aerosol‐Assisted CVD of Bismuth Vanadate Thin Films and Their Photoelectrochemical Properties

Brack

Sagu

Peiris

et al. 2015

Chemical Vapor Deposition

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“…6,7 Bismuth compounds have attracted increasing attention due to their interesting properties and structural diversities and, nowadays, numbers of bismuth compounds have been documented. [8][9][10] Organic ligands with various functional groups are important in the construction of metal compounds. Ncontaining heterocyclic ligands (e.g., 2,2'-bipy, 4,4'-bipy) have been broadly exploited for the syntheses of metal compounds due to their plenty of coordination sites and different coordination patterns.…”

Section: Introductionmentioning

confidence: 99%

In Situ Preparation, Structure, Photoluminescence and Theoretical Study of an Unusual Bismuth Complex

Chen

Huang²,

Yi³

2016

ACSi

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A novel bismuth photoluminescent material, (N,N'-dimethyl-2,2'-bipy) 2 (Bi 2 Cl 10 ) · 2H 2 O (1) (bipy = bipyridine), with the N,N'-dimethyl-2,2'-bipy 2+ moiety obtained in situ, has been synthesized under solvothermal conditions and characterized by single-crystal X-ray diffraction. Compound 1 is characterized by an isolated structure, consisting of N,N'-dimethyl-2,2'-bipy 2+ cations, Bi 2 Cl 10 4-anions and lattice water molecules. Photoluminescence experiments with solidstate samples discover that compound 1 exhibits a strong emission in the green region. Time-dependent density functional theory (TDDFT) calculation reveals that the essence of the photoluminescence of 1 can be assigned to the combination of the metal-to-ligand charge transfer (MLCT) (from the HOMO of the bismuth ion to the LUMO of the N,N'-dimethyl-2,2'-bipy 2+ moiety) and the ligand-to-ligand charge transfer (LLCT) (from the HOMO of the chloride ions to the LUMO of the N,N'-dimethyl-2,2'-bipy 2+ moiety).

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“…Second, it has low quantum efficiency and thus offering fast recombination of the photogenerated electron-hole pairs. 19 Accordingly, for improving the photocatalytic performance of β-Bi 2 as to obtain 2% wt loading are taken as starting material to dope the SnBi 3 material, which has been dissolved in distilled water forming an emulsion using a ball mill. [7][8][9] Accordingly, exploiting the advantages of the binary SnO 2 -Bi 2 O 3 mixed oxides have been considered and indeed catalyzed several reactions such as isobutene-to-methacrolein conversion 10,11 , Oxidative dehydrodimerization of propylene, 12 oxidative dehydroaromatization of isobutene, 13 and oxidative coupling of methane.…”

Section: Introductionmentioning

confidence: 99%

SnO₂(β-Bi₂O₃)/Bi₂Sn₂O₇ nanohybrids doped with Pt and Pd nanoparticles: applications in visible light photocatalysis, electrical conductivity and dye-sensitized solar cells

Khairy

Mohamed

2015

Phys. Chem. Chem. Phys.

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Bi2O3-SnO2 nanocomposites formed at a nominal molar ratio of 3 : 1 and loaded with Pd/Pt nanoparticles synthesized by a sol gel-hydrothermal method with the aid of a template were thoroughly characterized by X-ray diffraction, TEM-EDX, N2 sorptiometry, diffuse reflectance UV-Vis, FTIR, photoluminescence and electrical conductivity. It has been shown that Pd and Pt stimulate the existence of β-Bi2O3 and SnO2, respectively together with the key component Bi2Sn2O7. The photocatalytic results indicate that Pd/β-Bi2O3-Bi2Sn2O7 revealed a remarkable performance for the degradation of methylene blue (MB) dye as compared to the Pt/SnO2-Bi2Sn2O7 and Bi2O3-SnO2 samples in both the UV and visible regions. The enhanced photocatalytic activity of the Pd/β-Bi2O3-Bi2Sn2O7 nanocomposite is primarily attributed to the broad contact between the β-Bi2O3 and Bi2Sn2O7 phases, which indicates high mesoporosity and heterojunction structures resulting in separation efficacy between photo-induced electron-hole pairs. Specifically, the photosensitive β-Bi2O3 is easily excited and released electrons to be accepted by Bi2Sn2O7 and Pd that might be deposited in the interlayer between β-Bi2O3 and Bi2Sn2O7. The degradation mechanism of MB over Pd/β-Bi2O3-Bi2Sn2O7 in the visible region showed that the dye degradation proceeds through evolution of ˙O2(-) and ˙OH radicals as evaluated using photoluminescence and free radical trapping experiments. An insight into the electrical properties including the dielectric constant and impedance of the materials indicates that Pd/β-Bi2O3-Bi2Sn2O7 has the highest conductivity based on increasing the ionic transport and defects at the β-Bi2O3/Bi2Sn2O7 heterojunction. This material displayed an improved photocurrent response of a higher power conversion efficiency, exceeding that of Pt/SnO2-Bi2Sn2O7 and SnBi3 by 50% and 250%, respectively, in dye-sensitized solar cells. Picosecond-resolved photoluminescence (PL) and polarization gated PL anisotropy measurements were combined to clarify the process of FRET from the excited Pd/β-Bi2O3-Bi2Sn2O7 to SD N719. This indicates that the latter structure can be proposed as a multifunctional candidate for use in dye-sensitized solar cells, as an electrical material and as an efficient photocatalyst based on its versatile structure.

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A novel route to Pt–Bi2O3 composite thin films and their application in photo-reduction of water

Cited by 30 publications

References 32 publications

Aerosol‐Assisted CVD of Bismuth Vanadate Thin Films and Their Photoelectrochemical Properties

Aerosol‐Assisted CVD of Bismuth Vanadate Thin Films and Their Photoelectrochemical Properties

In Situ Preparation, Structure, Photoluminescence and Theoretical Study of an Unusual Bismuth Complex

SnO₂(β-Bi₂O₃)/Bi₂Sn₂O₇ nanohybrids doped with Pt and Pd nanoparticles: applications in visible light photocatalysis, electrical conductivity and dye-sensitized solar cells

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A novel route to Pt–Bi2O3 composite thin films and their application in photo-reduction of water

Cited by 30 publications

References 32 publications

Aerosol‐Assisted CVD of Bismuth Vanadate Thin Films and Their Photoelectrochemical Properties

Aerosol‐Assisted CVD of Bismuth Vanadate Thin Films and Their Photoelectrochemical Properties

In Situ Preparation, Structure, Photoluminescence and Theoretical Study of an Unusual Bismuth Complex

SnO2(β-Bi2O3)/Bi2Sn2O7 nanohybrids doped with Pt and Pd nanoparticles: applications in visible light photocatalysis, electrical conductivity and dye-sensitized solar cells

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Product

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SnO₂(β-Bi₂O₃)/Bi₂Sn₂O₇ nanohybrids doped with Pt and Pd nanoparticles: applications in visible light photocatalysis, electrical conductivity and dye-sensitized solar cells